To me praying plants are growing well and happy as hell.
Like these ones from my last flowering grow. These are under a 1000W Hortilux bulb on a light mover.
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Same plant in the front and center not long before harvest and still praying. Some strains do and some don't. That one is a KaliMist x NL#5.
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I run my 400W HPS about 8" above the canopy but make sure there is good airflow between the light and the plants. That 1000W is about 16" over the canopy but on a light rail so I'd have it around 24" if it were stationary.